package com.lrs.java.j2se_advanced.regexp;

import java.awt.BorderLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class FileChooser extends JPanel
                             implements ActionListener {
	private static final long serialVersionUID = 1536607071754321211L;
	
	static private final String newline = "\n";
    JButton openButton, extractButton;
    JTextArea log;
    JFileChooser fc;

    public FileChooser() {
        super(new BorderLayout());

        //Create the log first, because the action listeners
        //need to refer to it.
        log = new JTextArea(40,60);
        log.setMargin(new Insets(5,5,5,5));
        log.setEditable(true);
        JScrollPane logScrollPane = new JScrollPane(log);

        //Create a file chooser
        fc = new JFileChooser();

        openButton = new JButton("Open a File...",
                                 createImageIcon("images/open.gif"));
        openButton.addActionListener(this);

        //Create the search button.  
        extractButton = new JButton("Get SVN Number...",
                                 createImageIcon("images/search.png"));
        extractButton.addActionListener(this);

        //For layout purposes, put the buttons in a separate panel
        JPanel buttonPanel = new JPanel(); //use FlowLayout
        buttonPanel.add(openButton);
        buttonPanel.add(extractButton);

        //Add the buttons and the log to this panel.
        add(buttonPanel, BorderLayout.PAGE_START);
        add(logScrollPane, BorderLayout.CENTER);
    }

    public void actionPerformed(ActionEvent e) {

        //Handle open button action.
        if (e.getSource() == openButton) {
        	log.setText("");
        	int returnVal = fc.showOpenDialog(FileChooser.this);

            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();
                try {
                	extractFuzzyRow(file);
				} catch (Exception e1) {
					e1.printStackTrace();
				}
                
                //This is where a real application would open the file.
                log.append("Opening: " + file.getName() + "." + newline);
            } else {
                log.append("Open command cancelled by user." + newline);
            }
            log.setCaretPosition(log.getDocument().getLength());

        //Handle extract button action.
        } else if (e.getSource() == extractButton) {
        	String str = log.getText();
        	log.setText("");
        	extractOnTimeNum(str);
        }
    }

    public void extractFuzzyRow(File file) throws Exception {
    	BufferedReader bis = new BufferedReader(new FileReader(file));
    	Pattern p = Pattern.compile("(.*AXOIDS.*)|(.*\\[Ontime\\]_.*)",Pattern.CASE_INSENSITIVE);
    	
    	String str = null;
    	StringBuffer sb = new StringBuffer();

    	while((str=bis.readLine()) !=  null) {
    		
    		Matcher m = p.matcher(str);
    		while(m.find()) {
    			String matchStr = m.group();
    			sb.append(matchStr + newline);
    		}
    	}
    	
    	log.append(sb + newline);
    	bis.close();
    }
    
    public void extractOnTimeNum(String content) {
    	Pattern dp = Pattern.compile("(\\w[\\d]{3,6})|(\\w#[\\d]{3,6})",Pattern.CASE_INSENSITIVE);
		
    	Set<String> match = new HashSet<String>();
    	StringBuffer dsb = new StringBuffer();
    	
		Matcher dm = dp.matcher(content);
		while(dm.find()) {
			String matchStr = dm.group();
			if(!match.contains(matchStr)) {
				dsb.append(matchStr + newline);
				
				match.add(matchStr);
			}
		}
		
		log.append(dsb + newline);
    }
    
    
    
    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = FileChooser.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event dispatch thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("FileChooser");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setBounds(300, 120, 500, 400);

        //Add content to the window.
        frame.add(new FileChooser());

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                //Turn off metal's use of bold fonts
                UIManager.put("swing.boldMetal", Boolean.FALSE); 
                createAndShowGUI();
            }
        });
    }
}
